AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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Tom
November 24, 2009 05:20PM
You can try citing

S. A. Huettel and G. McCarthy. The effects of single-trial averaging upon the spatial extent of fMRI activation. Neuroreport 12 (11):2411-2416, 2001.

In this paper thy have a graph of stdev vs #trials averaged. The 'knee' of the graph is about 15 trials. Of course, this is for their particular experiment, but it does indicate that 18 trials is not necessarily a bad thing.
Subject Author Posted

number of trials

Elisa November 23, 2009 10:02AM

Re: number of trials

Gang Chen November 23, 2009 11:13AM

Re: number of trials

Elisa November 24, 2009 09:25AM

Re: number of trials

Gang Chen November 24, 2009 02:58PM

Re: number of trials

Tom November 24, 2009 05:20PM

Re: number of trials

Colm Connolly November 26, 2009 05:14PM